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A few minutes later she struggled to her feet。 Every part of her body was trembling。 She must head for the blockhouse； and find Gavin and her uncle。 They might be back already。 She must get help。 Someone who would destroy this loathsome beast； and then she would be back in London。
These thoughts were uppermost in her mind as she set off back across the silvery marshes。
CHAPTER SEVEN
PROFESSOR LOWSON and Gavin Royle halted on the banks of the big creek。 It had been their intention to cross it and gain access to the sea…wall a mile or so away； for from there they would have an elevated view of the saltings。 Also there was the chance that if the Slime Beast did decide to visit Sutton village again it would have to pass this way。
Now their plans were thwarted。 The tide had e in much quicker than they had expected probably because of the full moon。 Eight feet of water swirled before them and it was rising every second。
Professor Lowson turned to his panion。 'We'll have to try that rickety old footbridge further up。 I had a look at it yesterday。 It should bear our weight all right provided we don't both cross together。'
The bridge had been constructed by fenmen before the war and now age was beginning to eat into its structure。
'I'll cross first' said the Professor； testing the rotting beams with his foot。 They creaked ominously。 He took another step。 Two。
'Seems all right；' he mented； 'I'll。。 。'
Had Gavin been much shorter he would never have managed to reach Lowson in time。 The main supporting beam parted from the planks above with a pistol…like crack。 The bridge swayed； vibrated and then collapsed。
Gavin's strong fingers caught the Professor's outstretched arm and pulled； allowing his own body to fall backwards at the same time。 Together they sprawled in the mud； Gavin supporting the other with one hand while grabbing at a tussock of grass with the other。 The steep bank was slippery； yet somehow he managed to hold on。
Together they watched the debris being swirled round the bend out of sight
'That was close；' Lowson breathed； 'too close。 Thanks！'
'We shan't make the sea…wall tonight；' Gavin panted as he edged them both back up on to the safety of the paratively firm spartina grass。 〃Guess we'd best keep walking。'
It was then that they heard the scream。 Just once。 Then plete silence。
'It…came from over that way；' the Professor snapped。 〃Somewhere by the bend in the creek； about five hundred yards away。 e on！'
Take it steady；' Gavin restrained him。 'We don't want to run headlong into trouble。 Let's follow this path quietly through these rushes； and keep your eyes peeled。'
The path was soft and marshy and they were forced to move slowly。 Every so often they paused to listen。 Everywhere was still and eerie； the moonlight casting weird shadows。
'What's that？' Gavin pulled up abruptly and the Professor cannoned into him。 They listened。
A slurping sound came from not very far away； then silence again。 Something cracked and crunched like pieces of thin wood being snapped。 A movement。 They heard heavy determined footsteps； slow and measured。
'Get down quick！' Gavin snapped。 'It's ing this way！'
They dived back into the reeds； just in time。 Seconds later they saw the Slime Beast as it crossed the narrow marsh path less than ten yards away from them。
'Christ Almighty！' Gavin breathed。 'Just look at that！ You can smell it too。 And those scales…they're dripping with something else as well as slime： blood！'
'Follow it！' Lowson snapped。 'Don't let it get out of our sight！'
That scream。。。'
'Whoever it was they're beyond help now。 We mustn't lose it。 Get going man！'
The Slime Beast's progress was not difficult to follow。 The flattened rushes made the going much easier for them and the wind was blowing in from the sea。 They retched as the beast's odour was carried back to them。
Once clear of the large reed…bed they had to hang back for they would be seen too easily on the flat marsh。 However the Slime Beast forged steadily ahead never once looking back。
They followed it； keeping a distance of five hundred yards or so behind。 In the moonlight they caught a glimpse of something which shimmered in the distance。
'The mud…flats！' Lowson hissed。 'Or rather； the sea。 The tide's in。 That's where the Slime Beast's heading。'
It was true。 The Slime Beast was making directly for the mud…flats。 It was taking a definite course out towards the tide…line。
'You're right！' Gavin snapped。 'Just look at that。 It's walking straight into the sea。 That's where its lair is： on the sea…bed！'
There was nothing more they could do。 Slowly； without a word to each other； they turned and retraced their steps back to the blockhouse。
It was a very frightened Liz Beck who unfastened the door and admitted them。
'Whatever's the matter？' Gavin caught her by the shoulders and pulled her towards him。 'What's happened？ Where's Glover？'
'Dead！' she sobbed and burying her face against his broad chest she shook with tears。
Slowly； with many pauses； she told them the full story。
'It was 。。。 horrible；' she concluded。 'Can't we get away from here？ Right now。 Please！'
'Well we're safe enough for tonight；〃 Gavin said pouring the remainder of the brandy into a tumbler and handing it to her。 〃The Slime Beast's gone back into the sea。 It is satisfied for the moment so the odds are it won't venture forth until tomorrow night。 So； first thing in the morning I'm going into Spalding to see Chief…Inspector Harborne。 I want you to e with me； Liz。 We'll tell them the facts just as we know them。 The ball's in their court then。'
The expected outburst from Professor Lowson was not forthing。 Instead he merely nodded； turned on his heels and went back to his quarters。
'No protest。' Liz was more posed now and managed a weak smile。 'I expected him to blow his top。'
'Probably he realises the futility of it。' Gavin slipped an arm round her and kissed her。 'All the same I don't trust him。 He's got something up his sleeve。 I can't see him just giving up and leaving it all to the authorities。'
'Nor can I。 One point though。 If and when we manage to convince them that there's a dangerous beast； possibly from outer space； on the loose； what then？ Do we go back to London？'
'I'll put you on the first train；' he promised。
She shook her head and a defiant gleam crept into her eyes。
'I said we；〃 she snapped。 'What about you； Gavin？ '
'I'll probably hang on for a day or two；' he said； trying to appear casual。 'I'd like to see this thing through since we were in at the start of it'
'Then I'm stopping with you。 I don't go from here until you do。'
He stood up。 'There's no point。 Look at it from a reasonable point of view。 The army'll take over no doubt。 There won't be any danger。'
'So th