The Aldens have joined Dr. Iris Perez as she investigates legendary creatures around the world. In this adventure, the children investigate what might be living in the deep trench off the coast of Puerto Rico. From manatees to mermaids to sea monsters, creatures of the sea have been attracting tourists to the area for years. But when a man on a nearby island goes missing, it's up to the Aldens to sort out fact from fiction.
| ISBN: | 9780807508169 |
| Publication date: | 1st September 2021 |
| Author: | Gertrude Chandler Warner |
| Illustrator: | Thomas Girard |
| Publisher: | Random House Books for Young Readers an imprint of Random House Children's Books |
| Format: | Paperback |
| Pagination: | 144 pages |
| Series: | The Boxcar Children Creatures of Legend |